It looks like both of them splattered pretty good, hitting that concrete. The heavier the projectile will have more energy. So a .50 caliber roundball is 177 grains while a green band powerbelt is I believe 295 grains. Much heavier. So of course the powerbelt would have had more energy with the same powder charge. Why one splatters and falls to the ground while another bounces, could be where they hit on the concrete, the shape of the projectile, and a hundred other things.. I just don't know.